I have recently added a custoemr provided VVX 300 and a Soundstation IP 6000 to a version 15 3cx system. I configured them useing the "simple setup" using server IP address, user name and passowrd. These phones are off site. They register and we are able to dila out. When one phone calls another or if we call it directly thru did numbers, they ring but there is no "ring back" heard from the calling phone and it cannot be answered from either the handset, speaker or answer button. I do noth think it is firmware and both phones act the same and they are two different phone types.
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